After 12 years of mass computer use with no issues, eyestrain exploded onto the scene, and has been an every day issue since. but nothing had changed?

Need glasses: You need glasses if you don't currently wear them or an update of your glasses if you do.

Computer Vision Synd: Hard to say without an exam. So many things could be causing your symptoms. Dry eyes, prolonged light exposure, eye muscle fatigue, uncorrected refractive error could all be factors. Perhaps see a local doctor and they will be able to diagnose the culprit.